The concepts of fear and confusion are intertwined; they were alarmed by the miraculous deeds performed by the Savior. Trembling signifies fear, as those who are frightened often shake in trepidation. Alternatively, this can be interpreted as those drawn to Christ being shaken by the rumors circulating about Him, overwhelmed by their own misunderstandings.
The foundations of the mountains were shattered and stirred, signifying God's displeasure towards them. Here, "mountains" symbolize demons, reflecting their inherent pride and arrogance, while the foundations represent their hidden malevolent schemes. Witnessing Christ's unassailable power, the demons were consumed by uncertainty, questioning who this figure could be, and pondering the repercussions of their impending suffering at His hands. Thus, their thoughts were thrown into chaos, causing them to be unsettled and diminished from their previously held dominion over the world. This was a consequence of divine wrath for their oppression and enslavement of the downtrodden human race. Moreover, this scripture can also be interpreted as predicting the natural phenomena that occurred during the Lord's crucifixion, when the earth quaked and the stones were split, in response to God's anger towards the Jewish people.